地铁隧道近距离下穿输水暗涵安全影响研究  

Safety Study of Subway Tunnel Undercrossing Existing Buried Conveyance Culvert

作　　者：翟明杰[1] 杨进新[1] 付云升[1] 朱银邦[2] Zhai Mingjie;Yang Jinxin;Fu Yunsheng;Zhu Yinbang(Beijing Institute of Water, 100048, China;China Institute of Water Resources ＆ Hydropower Research, Beijing 100048, China)

机构地区：[1]北京市水利规划设计研究院,100048 [2]中国水利水电科学研究院,北京100048

出　　处：《特种结构》2018年第3期29-35,共7页Special Structures

摘　　要：为分析地铁隧道近距离下穿输水暗涵对暗涵结构及运行安全的影响,本文针对北京某地铁隧道下穿南水北调输水暗涵工程进行安全影响研究,通过建立三维有限元模型,经反演分析得到了地表沉降模型计算数值与实际监测数值相近时的模型计算参数,并间接得到了此时暗涵所处的变形及应力状态。计算结果表明,与实测地表沉降相对应的暗涵轴向附加应力未超过允许值,地铁列车震动荷载及隧道与暗涵之间灌浆参数对地表沉降及暗涵应力影响较小。考虑到有限元法未对土体可能存在的缺陷、孔洞等进行模拟,因此建议对地铁隧道与暗涵之间夹层土体进行补注浆加固,以提高土体的密实度和均匀性。In order to analyze the influence of the newly-built subway tunnel on the existing overcrossing water conveyance culvert＇s structure and operation safety, the impact of a Beijing subway tunnel excavation on the safety of South-to-North Water Diversion Project water culvert was studied in this paper. Using a three dimensional finite element model, the parameters were obtained by inverse analysis assuming that the calculated surface settlements match well with the field measurements. The deformation and stresses of the buried water conveyance culvert were also obtained. The results indicated that the added axial stress does not exceed the allowable value. Factors including subway train vibration loads and the parameter values of grouting which is injected between tunnel and culvert have little impact on the ground settlement and buried culvert stress. Considering that the finite element method does not simulate the possible defects, holes, etc., it is suggested that soil grouting is aimed to improve the compactness and uniformity of soil between subway tunnel and buried culvert.

关 键 词：地铁隧道 输水暗涵 下穿 沉降 反演分析 

分 类 号：TV672[水利工程—水利水电工程] U231.3[交通运输工程—道路与铁道工程]